[Samba] Virus found in the message

[mmsmtp at edo.uni-dortmund.de]

Scanner: MailMonitor for SMTP v1.2.2 

Problem description:
Email data:
MessageID: <20030821162429.5695A4AA336 at nx5.hrz.uni-dortmund.de>
From: <samba at lists.samba.org>
To: <frontpage at edo.uni-dortmund.de>
Cc: 
Subject: Thank you!
Scanning part []

Scanning part [thank_you.pif]
Attachment validity check: passed.
Virus identity found: W32/Sobig-F